THIS IS A CERAMIC SOCKET, A COMPONENT PART OF A CERAMIC BALL VALVE. IT CAN BE USED ON BOTH SIDES OF THE CERAMIC BALL TO CREATE A LEAK TIGHT SEAL. IT HAS A HARDNESS EQUIVALENT TO 9 OR MORE ON THE MOHS SCALE

GENERAL INTERPRETATIVE RULES 1 & 6 OF THE COMBINED NOMENCLATURE; TEXT TO CODES 6909 & 6909 12; NOTE 1(b) TO CHAPTER 84 IN THE HARMONISED SYSTEM EXPLANATORY NOTES; EXCLUSION NOTE (a) TO CHAPTER 84.81 (PARTS)